A nights soak when wound and then hung in a jar in an USM for 5 minutes to clear out any old oil and dirt then 2 rinses...has you a clean movement. Being wound and left ticking during a long soak means the cleaning fluid can get inbetween the mainspring coils as it unwinds to some degree. Timex apparently researched this cleaning approach and only recommended removing the balance, cannon pinion, ratchet wheel bridge, ratchet wheel and click. Definitely should be oiled afterwards though, its possible to get a lot of it if not all done if you think it through. The v-conic balance should be removed to fill the cups to their required levels. I managed to do this without removing the balance by very carefully adding oil to the inside edge of the cup with a super fine oiler ( it took some time ) the top cup was very tricky because of the closeness of the hairspring...a very steady hand is needed for that., I have this late 1960s Timex Mercury watch I got seven months ago. It has a M24 movement And I read about lighter fluid trick that works on most vintage Timex watches (Someone on YouTube even claimed they put their, or their dad's, I forgot who, Timex watch in a lighter fluid and they run smoothl, hi guys, my obsession is early Timex watches from the 1950s, 60s and 70s with a particular focus on 1976 birth year watches, Dundee made pieces and early 50s pieces..